Open AccessTime series analysis of natural remanent magnetization in deep‐sea sediments
Author(s) -
Okubo Shuhei,
Takeuchi Hitoshi
Publication year - 1979
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1979.tb00166.x
Subject(s) - natural remanent magnetization , geology , earth's magnetic field , remanence , declination , paleomagnetism , geophysics , secular variation , magnetic declination , saturation (graph theory) , series (stratigraphy) , magnetostratigraphy , period (music) , geomagnetic secular variation , magnetization , oceanography , paleontology , magnetic field , physics , quantum mechanics , mathematics , astronomy , combinatorics , acoustics , geomagnetic storm
Summary Natural remanent magnetization (NRM) and saturation isothermal remanent magnetization (SIRM) of deep‐sea sediments from the equatorial Pacific and south‐western Indian Ocean were subjected to time series analysis. Three different approaches were employed to investigate the variation of geomagnetic total force. At both sites, these analyses show periodicities of 25 000 and 18 000 yr. The period of 25 000 yr, which is nearly equal to the Earth's precessional period (25 800yr), suggests that the precession plays some role in the generation of the geomagnetic field. Fluctuations of palaeo‐magnetic declination and inclination seem to have no remarkable periodicities.